I bought some seed of Chrysanthemum carinatum from two different producers, as seen on photos. How come they are different? The left hand side is 1gr, the right hand one 0.5gr. The price was about the same. Which one is better?
I bought a packet of "painted daisy" seeds that did not give the botanical name. The image on the packet, and the common name, most closely matched Tanacetum coccineum, formerly known as Chrysanthemum coccineum, and it has white, pink, or red rays and yellow center disks, Painted Daisy (Tanacetum coccineum). Another name for it is "Pyrethrum". The seeds I have look similar to the ones on the right of your first image, though they do not have the prominent striping.
Chrysanthemum carinatum, now known as Ismelia carinata, also came up for me when looking for "painted daisy" and those seeds match the flat round seeds on the left of your first image. The Ismelia carinata flowers look similar in form to Tanacetum coccineum, but the petals have a ring of color around the center, in addition to having yellow or orange rays unlike Tanacetum coccineum. The centers are dark brown to red Painted Daisy (Ismelia carinata).
Given all the name changes of these two plants, and their similarity, I'm going to guess that your mystery seeds might be Tanacetum coccineum.